Help!! 31 weeks & stomach bug?

Nell • Army wife🇺🇸2 year old son & baby on the way! 👶💍💕

So I’m 31 weeks pregnant and Iv been having diarrhea going on day 3..the first day I threw up twice but haven’t since. I haven’t been able to eat much but if I do it comes out right away on the toilet.

Also my lower back is hurting but it could be from laying in bed for so long. It’s the worst time (Christmas time) to be sick and to go into urgent care but i don’t know what to do! Is it just a nasty bug??